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a.go
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a.go
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package main
import (
"fmt"
"strconv"
"strings"
)
func usage() {
fmt.Printf(`
Usage: god --pidfile daemonize.pid --pidclean --interval 86400 -s program args ...
--pidfile A pidfile which process id will be stored.
--pidclean Clean old pidfile if there is one and try to run this program
--graceful Restart program in sequence
--interval Number of seconds to restart all programs, given in integer. Minimum is %.0f seconds
--watch dirs to watch for file changes
--watch-exts file extenstions to watch, default by watching all extenstions
--delay number of seconds to countdown before restarting the program when any file is changed
--log Log filename, output from stdout of child process
--log-err Log filename for errors, output from stderr of child process
-s program [args] Program you want to run in background. Can repeat for multiple daemons
args Other arguments that you want to pass to daemons
god --version For printing out version
Example: god --pidfile god.pid -s sleep 10`+"\n", MIMIMUM_AGE)
}
type Args struct {
args []string
pidFile string
graceful bool
logFile string
logFileErr string
force bool
programs []string
programArgs [][]string
help bool
version bool
interval int
fileWatched bool
fileWatchedDirs string
fileWatchedExts string
delaySecs int
fileWatchedDone chan bool
}
func (a *Args) Parse(args []string) error {
max := len(args)
a.delaySecs = 3
for i := 0; i < max; i++ {
if args[i] == "--help" {
a.help = true
return nil
}
if args[i] == "--version" {
a.version = true
return nil
}
if args[i] == "--pidfile" {
i++
if i >= max || !isArgValue(args[i]) {
return fmt.Errorf("Invalid pidfile value")
}
a.pidFile = args[i]
continue
}
if args[i] == "--graceful" {
i++
a.graceful = true
continue
}
if args[i] == "--interval" {
i++
if i >= max || !isArgValue(args[i]) {
return fmt.Errorf("Invalid interval value")
}
interval, err := strconv.Atoi(args[i])
if err != nil {
return fmt.Errorf("Invalid interval value")
}
if float64(interval) <= MIMIMUM_AGE {
return fmt.Errorf("Minium value for interval is %.0f seconds", MIMIMUM_AGE)
}
a.interval = interval
continue
}
if args[i] == "--watch" {
a.fileWatched = true
i++
a.fileWatchedDirs = args[i]
continue
}
if args[i] == "--watch-exts" {
a.fileWatched = true
i++
a.fileWatchedExts = args[i]
continue
}
if args[i] == "--delay" {
i++
delay, err := strconv.Atoi(args[i])
if err != nil {
return err
}
a.delaySecs = delay
continue
}
if args[i] == "--log" {
i++
a.logFile = args[i]
continue
}
if args[i] == "--log-err" {
i++
a.logFileErr = args[i]
continue
}
if args[i] == "-s" {
i++
if i >= max || !isArgValue(args[i]) {
return fmt.Errorf("Invalid program")
}
a.programs = append(a.programs, args[i])
programArgs := findProgramArgs(args, i+1)
a.programArgs = append(a.programArgs, programArgs)
i += len(programArgs)
continue
}
if args[i] == "--pidclean" {
a.force = true
continue
}
a.args = append(a.args, args[i])
}
return nil
}
func findProgramArgs(args []string, start int) []string {
var pargs []string
max := len(args)
for n := start; n < max; n++ {
if isNextProgram(args[n]) {
break
}
pargs = append(pargs, args[n])
}
return pargs
}
func isNextProgram(arg string) bool {
return arg == "-s"
}
func isArgValue(value string) bool {
return strings.Index(value, "-") != 0
}